Improvement in metal-drawing presses



0. SMITH.

v METAL DRAWING PRESS. No. 189,277. Patented Apri13, 1877.

M PETERS PHOTO-Lll'iiOGRAPNER. WASHINGTON. I74 1:

4 'SheetsSheet 1.

e-sheets-sheei s. 0. SMITH. METAL DRAWING PRESS.

Patented Apr'113, 1877.

l i '!'hillmlillaz m 0 ll'" N. PETERS FHOTOJJTHOGRAPNER. WASHINGTON. itQ Q 4Sheets-Sheet4Q .0 SMITH.

METAL DRAWING PRESS. N ,189,Z77, Patented Apr i13, 1877.

wmmns, PHOT0-UTMOGRAPHER, WASHiNQ TON. 0,,C.\

inafter set forth.

.UNI'IED STATES I PATENT QFFICE,

IOBERLIIN SMITH, on BRIDGETIQQN, NEWJERSEY.

IMPROVEMENT m METAL-DRAWING P'RESSES.

" Specification forming part of Letters Patent No. 189,277, dated April3, 1877; application filed i December 5,1876.

' in the State of New Jersey,have invented certain new and usefulImprovements in Drawing-Presses; and do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to'the accompanying drawings, making a part of thisspecification, in 'whichproved press as arranged for use; and Fig, 2 isa vertical central section of the same upon a line passing from front torear, and shows the parts in their normal positions.' Fig. 3Qis a likeview of said press, its operative parts being in the position occupiedafter the production of a blank and the drawing of the same. Figs. 4and'5 are perspective 'views .of

" my die-clamp, the parts being,'respectively, separated from andcombined with each other and Figs. 6 and 7 are vertical central sectionsof said clamp as arranged upon or within the bed-plate of the press.

Letters of like name and kind refer to'like parts in each of thefigures. I

The design of my invention is mainly to combine in a convenient andpracticable form a cutting and a drawing press, by means of which thearticles to' be formed may-be cut from a plate and drawn to shape by onemovement of the foot-lever; to which end it consists, principally, in apress'for cutting and drawing sheet metal, in which the bar that carriesthecutting-die is moved positively by the bar which carries thedrawing-die, substantially as and for the purpose hereinafter[hereinafter shown.

It consists, further, in the means employed for regulating the movementof the cuttingdie, substantially as and for the purpose here- 'Itconsists, further, in the m'eans'employed for regulating the downwardmovement of the drawing-dies, substantially as and for the purposehereinafter shown and described.

It consists, finally, in the peculiar construction of the die-clamp,substantially as and for the purpose hereinafter specified. In theannexed drawings, A represents'the bed-plate of my press, which issupported upon or by means of three legs, B, and is provided with acentral opening, a, for the recep- V tion of fixed or female dies.Figure l is a perspective view of my im- From the rear side of thebed-plate A a standard, 0, extends upward and forward, and within itsfront side is provided with a vertical dovetail-shaped groove, 0, whichreceives and contains a bar, D, the latter being'capable of alongitudinal motion within said groove.

Within the rear side of the bar'D, at its transverse center, isprovideda rectangular groove, 11, that receives and contains acorrespondingly-shaped bar, E, which latter is capable of an independentlongitudinal motion withinits said groove.

Vertical motion is imparted to the bars D and E by means of a lever,F,which has its front end contained within vertical central openings'd ande, that are providedin and through said parts, and is pivoted Within asimilar opening, 0, in the standard 0, a short distancein rear of itssaid front end.

From the standard 0 the lever F extends rearward for some distance, andby means of a forked bar, G, threaded bar H, and nuts I and K, ashereinafter described, is connected to'or with the rear end of afoot-lever, L,

same and said foot-lever, will return said parts to their normalpositions. If necessary, additional weight may be added to the rear endof said lever F by bolting metal plates F upon opposite sides, as shownin Fig. 1.

The barD is intended to sustain and operate the male cutting-die M, andthe, bar E to operate the male forming or drawing die N,

said dies being attached to or upon their lower ends, in consequence ofwhich use it. is necessary that said bar D should move in advance ofsaid bar E, so that the blank may be out from the sheet of metal beforesaid forming die operates upon it.

The desired result is accomplished by constructing the dies so that theforming-die N is contained within a central recess oropening, an, in thecutting-die M, while the female forming-die O is constructed or placedwithin the bottom of the female cuttingdie P, and then arranging themotions of said bars D and E so that said male cutting-die M shall movedownward until it has cut a blank, and holds the same firmly against thetop of its female die 0, after which its motion ceases, and said die Ncontinues and presses said blank into and through said die 0.

The relative movements of the bars D and E are eflected' by thefollowing-described means The opening d of the bar D is lengthened, soas to prevent the end of the'lever F (which end is provided with afriction-roller, f) from hearing against the lower end of the same, anda projection, e, which has a forward and an upward curve, is providedupon the front side of said bar E below the lever-open ing 6. Within thelower end of said recess (1 is pivoted a block, Q, which has the generalform of a triangle, and is so arranged .as to permit of being turned tothe position shown in Fig. 2, with its upper arm q in engagement withsaid projection e, or of being moved to the position seen in Fig. 3, soasto disengage said parts. When the block Q occupies the position shownin Fig. 2, the downward motion of the bar E will be communicated to thebar D; but when said block is released from engagement with the spur c,said bar E is y at liberty to continue its downward motion withoutmoving said bar D.

The arm q of the block Q is held in engagement with the spur e by meansof aspr'ing, m, which is placed below its lower arm q, while said blockis tripped, so as to release it from engagement with said spur, by meansof a jointed bar, R, which is pivoted at one end to the lower portion ofsaid arm q, and from thence extending upward and outward through i asuitable opening in a vertically-adjustable. support, S, has its outerend threaded and 1 tion is employed:

provided with a nut, r.

When the bars D and E move downward until the jointed bar B isstraightened, further I motion of said parts causes said'bar R to drawthe arm q of the tripping-block Q forward until released from engagementwith the spur 6, while upon reversing the motion of said parts said barB yields and permits the spring a: to move said block Q into engagementwithsaid Splll' 01106 IHOI'Q.

When the bar D has reached the limit of its downward stroke, and isreleased from engagement with the bar E, it is necessary that the formershouldbe locked in position for the purpose of confining the blank justout between the male cutting-die Maud the upper endofthe femaledrawing-die O, which result 'is secured by providing upon the lower end,

at the rear side of the block S, a spur, s, that extends rearward andengages with the arm q as the latter passes from beneath the spur e.

The front side of the, spur e bears against the rear side of the arm qwhen the latter is in engagement with the spur s, and prevents itsdisengagement from the latter; but as the bar E moves upward said spur 0passes above said arm, and permits the latter to be moved rearward oncemore by the spring as.

In order that the downward limit of motion of thebar D of V thecutting-die (which latter also operates as a holding-die) may be variedfor the purpose of securing a proper adjustment' of parts, theblock S isbolted to or upon the rear face of a yoke,"l, that spans the front sideof said bar D, and at its end is secured rigidly to or upon the standard.0. y A lug, .9, projects forward from the upper end of said block Sover. said yoke, and a screw, 27, passes throughs'aid lug into a thread:ed opening in the latter. =By loosening the bolt t, which'confines theblock S in'place, said block may be adjusted vertically by the movementof the screw t, the latter being, preferably, swiveled within the lug,s, so as to move {the same in either direction.

In order to compensate for the wear of the tion of said standard. Bytightening said screw the groove 0 will be lessened in breadth, and lesslateral motion allowed to said bar D.

The foot-lever L is intended to move within certain fixed limits,and inorder that the motion of the lever F may be varied at will, the lower'section Hof the connection between said parts is arranged to beattached at a number of points between the rear end and pivotal bearingof said foot-lever; but as such change in the point of attachment willvary the relative position of said lever F, the following-describedconstruction of said connec- The upper sectionG has itslower end forked,and the ends of said forks connected by means of a horizontal bar, g.Through said bar g passes loosely the threaded upper portion of thelowersection H, and upon the end of the latter, above said barg, is looselyfitted a nut, I, while below said bar is placed a second nut, K, whichis formed within or of the hub of a hand-wheel. a

By loosening the nut K with the hand, the uppernut I may be turned withthe fingers until the proper length of the connection isfollowing-described clamp:

A sleeve, V, having a flattened upper por tion, which is terminated by aprojecting flange, v, and a threaded lower portion or body, 22, islooselyfitted within a radial vertical slot, a, in the bed-plate A, andis held in position therein by means of a nut, W,that is fitted oversaid threaded portion and bears against the lower side of saidbed-plate.

Within the sleeve V is loosely fitted a bolt, X, which, at its upperend, is provided with a head, as, that extends horizontally outward fromone side, and fits within a corresponding recess, '0, that is providedwithin the upper end of said sleeve at the side next to the die P. Thelower portion of the boltX is threaded, and projects below the sleeve V,and upon such portion is loosely fitted a nut, Y. A nut, Z, constructedin the form of a hand-wheel, is fitted loosely upon the lower portion ofsaid sleeve, below the nut W, and completes the device, the operation ofwhich is as follows:

The clamp-bolt X being in position, the

wheel-nut Z is turned downward, and as it impinges against the nut Y thefriction between their contiguous faces will cause the latter to move inthe same direction; but as the screw-thread of the sleeve V has agreater pitch than the thread of said bolt, it will be seen that saidwheel-nut will move downward more rapidly than said nut Y, and, asaconsequence of such differential motion, said bolt will be drawndownward with great force.

Having thus fully set forth the nature and merits of my invention, whatI claim as new 1s 1. A press for cutting and drawing sheet metal,'inwhich the bar that carries the cutting-die is moved positively by thebar which carries the drawing-die, substantially as and for the purposespecified. I

2. The means employed for combining the movements of the bars D and E,consisting of the tripping-block Q, pivoted within said bar D, andprovided with an arm, g, which is caused to engage with a spur, e, uponsaid bar E by the pressure of the spring at, substantially as and forthe purpose shown.

3. The means employed for disengaging the bar D from the bar E,consisting of the jointed bar It, pivoted to or upon the tripping-blockQ, and connected to or with the block S, substantially as and for thepurpose set forth.

4. The means employed for locking the bar D at its lowest point,consisting of the tripping-block Q q and spurs s and e, substantially asand for the purpose shown and described.

5. In combination with the bar D, trippingblock Q, and jointed bar R,the block S, secured to or upon the yoke T, and made verticallyadjustable by means of the screw t, swiveled within the lug s,substantially as and for the purpose specified. l 6. In combination withthe levers F and L, the connection formed by the forked bar G g,threaded bar H, and nuts I and K, substantially as and for the purposeshown.

7. The hereinbeforedescribed die-clamp, consisting of the threadedsleeves V v 'v, the threaded bolt X E, and the nuts W, Y, and Z, allcombined to operate in the manner and for the purpose substantially asset forth.

In testimony that I claim the foregoing I have hereunto set my hand this4th day of December, 1876.

OB ERLIN SMITH.

Witnesses JAMES J. REEVES, E. EQBREWSTER.

